[gtk+] wayland: Survive without primary selection

[Matthias Clasen <matthiasc src gnome org>]

commit 914f7bd6e48a09025ae35927813fdee863a53881
Author: Matthias Clasen <mclasen redhat com>
Date:   Fri Feb 26 19:41:25 2016 -0500

    wayland: Survive without primary selection
    
    I am testing GTK+ master against mutter 3.19.90, so I'd
    like GTK+ to survive even when the compositor does not
    support the primary selection interface.

 gdk/wayland/gdkdevice-wayland.c    |   13 ++++++++-----
 gdk/wayland/gdkselection-wayland.c |   11 +++++++----
 2 files changed, 15 insertions(+), 9 deletions(-)
---
diff --git a/gdk/wayland/gdkdevice-wayland.c b/gdk/wayland/gdkdevice-wayland.c
index e093bc0..9b085ad 100644
--- a/gdk/wayland/gdkdevice-wayland.c
+++ b/gdk/wayland/gdkdevice-wayland.c
@@ -2920,11 +2920,14 @@ _gdk_wayland_device_manager_add_seat (GdkDeviceManager *device_manager,
   wl_seat_add_listener (seat->wl_seat, &seat_listener, seat);
   wl_seat_set_user_data (seat->wl_seat, seat);
 
-  seat->primary_data_device =
-    gtk_primary_selection_device_manager_get_device (display_wayland->primary_selection_manager,
-                                                     seat->wl_seat);
-  gtk_primary_selection_device_add_listener (seat->primary_data_device,
-                                             &primary_selection_device_listener, seat);
+  if (display_wayland->primary_selection_manager)
+    {
+      seat->primary_data_device =
+        gtk_primary_selection_device_manager_get_device (display_wayland->primary_selection_manager,
+                                                         seat->wl_seat);
+      gtk_primary_selection_device_add_listener (seat->primary_data_device,
+                                                 &primary_selection_device_listener, seat);
+    }
 
   seat->data_device =
     wl_data_device_manager_get_data_device (display_wayland->data_device_manager,
diff --git a/gdk/wayland/gdkselection-wayland.c b/gdk/wayland/gdkselection-wayland.c
index 9fcb313..eff802e 100644
--- a/gdk/wayland/gdkselection-wayland.c
+++ b/gdk/wayland/gdkselection-wayland.c
@@ -1089,10 +1089,13 @@ gdk_wayland_selection_get_data_source (GdkWindow *owner,
 
   if (selection == atoms[ATOM_PRIMARY])
     {
-      source = gtk_primary_selection_device_manager_create_source 
(display_wayland->primary_selection_manager);
-      gtk_primary_selection_source_add_listener (source,
-                                                 &primary_source_listener,
-                                                 wayland_selection);
+      if (display_wayland->primary_selection_manager)
+        {
+          source = gtk_primary_selection_device_manager_create_source 
(display_wayland->primary_selection_manager);
+          gtk_primary_selection_source_add_listener (source,
+                                                     &primary_source_listener,
+                                                     wayland_selection);
+        }
     }
   else
     {